Swift SpriteKit - Shake Screen Effect

func shakeCamera(layer:SKSpriteNode, duration:Float) {

 let amplitudeX:Float = 10;
 let amplitudeY:Float = 6;
 let numberOfShakes = duration / 0.04;
 var actionsArray:[SKAction] = [];
 for index in 1...Int(numberOfShakes) {
 let moveX = Float(arc4random_uniform(UInt32(amplitudeX))) - amplitudeX / 2;
 let moveY = Float(arc4random_uniform(UInt32(amplitudeY))) - amplitudeY / 2;
 let shakeAction = SKAction.moveByX(CGFloat(moveX), y: CGFloat(moveY), duration: 0.02);
 shakeAction.timingMode = SKActionTimingMode.EaseOut;
 actionsArray.append(shakeAction);
 actionsArray.append(shakeAction.reversedAction());
 }

 let actionSeq = SKAction.sequence(actionsArray);
 layer.runAction(actionSeq);
}

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